Hi all,
A couple of months ago I bought the LPC-2478stk board to experiment with.
I decided to make a hexapod called “James” 
and initialized the board using a gnu compiler toolchain under eclipse. The code is currently running from the internal flash and the LCD framebuffer is in the SDRAM.
With an USB tiny probe I am able to upgrade/debug the board.
Here you can see a movie of my robot : http://www.youtube.com/watch?v=GMMxXjV6AHU
Now the board is currently running on 57.6MHz and runs very stable.
The settings I use at 57.6 MHz are
PLLCFG = PLL_MValue | (PLL_NValue << 16) where PLL_MValue = 11 and PLL_NValue = 0
PLLCON = 3 (fully enabled)
PCLKSEL0 and PCLKSEL0 = 0x55555555
CCLKCFG = 4
USBCLKCFG = 5
MAM settings :
MAMCR = 0;
MAMTIM = 5; (if <5 the uart data at 115200 becomes corrupt/controller hangs)
MAMCR = 2;
The dataspec says the controller can run up to 72MHz but I tried all kind of configurations and did not find a stable one.
Are there people out there that have the board working stable at 72MHz?
I am not an expert at these things so any help is welcome 
Jeroen